Hi,
In some FindXXX.cmake, pkgconfig is used to locate include directories
libraries, definitions etc. I would like to set the environment variable
PKG_CONFIG_PATH to $MYLIBDIR:$PKG_CONFIG_PATH, hence pkg-config will look
first for $MYLIBDIR/mylib.pc
EXECUTE_PROCESS and EXEC_PROGRAM allow to execute processes but they do not
allow to change environment variable.
A non portable workaround for unix is to call export:
EXECUTE_PROCESS(COMMAND sh -c "export PKG_CONFIG_PATH=${_pkgpath}"
COMMAND ${PKGCONFIG_EXECUTABLE} --print-errors --exists${_package}
RESULT_VARIABLE _return_VALUE OUTPUT_VARIABLE _pkgconfigDevNull )
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